bash字符串相等[重复]

在 bash ,相等和双重相等测试运算符之间有什么区别(如果有)?

[[ "a" = "a" ]] && echo equal || echo not-equal
[[ "a" == "a" ]] && echo equal || echo not-equal
[[ "a" = "b" ]] && echo equal || echo not-equal
[[ "a" == "b" ]] && echo equal || echo not-equal

结果:

equal
equal
not-equal
not-equal